TRAVERSE CITY, Mich. — Michigan officials are demanding an extensive set of records from Enbridge as they investigate the company's oil pipeline beneath a Great Lakes waterway. The state Department of Natural Resources sent a letter Monday to the Canadian company requesting documents dating back to 1953, when Line 5 was placed in the Straits of Mackinac. The DNR is reviewing Enbridge's compliance with terms of the agreement that allowed the twin pipelines to run through the straits, which connect Lakes Huron and Michigan. The DNR wants records dealing with issues such as gaps that have formed beneath the pipes and in their outer coating. Enbridge says it has received the letter but declines comment on how it will respond.